Olimpiada Española de Química (OEQ)¶

Overview¶

The Olimpiada Española de Química (OEQ) is Spain's national chemistry competition for secondary school students, organized by the Real Sociedad Española de Química (RSEQ) in collaboration with the Ministry of Education and the Conferencia Española de Decanos de Química. The RSEQ traces its origins to 1903 (as the Real Sociedad Española de Física y Química), splitting into independent physics and chemistry societies in 1980.

The OEQ serves as the selection pathway for both the IChO (4 students) and the OIAQ (4 students) teams. Approximately 125 students compete at the national phase each year, drawn from local qualifying rounds across all Spanish autonomous communities. The top performers train at Universidad Rey Juan Carlos (URJC) in Madrid before representing Spain internationally.

Spain has participated in the IChO since 1996 (29 editions) and has earned 0 Gold, 3 Silver, 26 Bronze, and 17 Honorable Mentions. The country's best IChO performance was in 2002 (2 silver, 1 bronze) and 2019 (1 silver, 2 bronze). At the OIAQ, Spain is a consistently strong performer, winning the overall competition at the 29th OIAQ in 2025 (Mexico), where Carlos Calderón Alba finished first overall.

Key Websites¶

Competition Pipeline¶

The OEQ follows a three-phase structure: Local → National → International.

Phase 1: Local (February–March)¶

Local qualifying rounds are held at participating universities across Spain's autonomous communities. The format varies slightly by region but typically includes:

Problems exam: 90 minutes, 3 multi-step problems
Theoretical questions: 60–90 minutes, 35 multiple-choice questions (4 options, 1 correct)
Topics: Stoichiometry, organic/inorganic nomenclature, atomic structure, periodic table, chemical bonding, thermodynamics, kinetics, chemical equilibrium, acid-base equilibrium, solubility

Some universities also run a pre-selection exam in November followed by training workshops (e.g., 12 afternoon sessions of 4 hours each). Top scorers from each university district advance to the national phase.

Phase 2: National (April)¶

The national phase is held over a weekend at a rotating host university. The format includes:

Friday: Inauguration ceremony
Saturday morning: Theoretical and practical examination (problemas y cuestiones)
Sunday: Awards ceremony

Approximately 125 students compete (confirmed for the XXXVIII edition, 2025, at Universidad de Córdoba). Gold, silver, and bronze medals are awarded based on scores.

Phase 3: International Teams¶

IChO team (4 students): Trains at URJC Madrid (online + in-person lab sessions) before competing in July.
OIAQ team (4 students): Competes in the Ibero-American Chemistry Olympiad in September–October.

Exam Topics and Difficulty¶

The OEQ tests chemistry at an advanced high school / introductory university level:

Local phase: Covers the standard Spanish Bachillerato chemistry curriculum with additional depth — stoichiometry, thermodynamics, kinetics, equilibrium, acid-base, electrochemistry, atomic structure, periodicity, bonding, descriptive chemistry, and basic organic nomenclature.

National phase: Significantly harder, with multi-step problems requiring integration of multiple concepts. Topics extend to introductory organic chemistry (functional groups, reaction types), complex equilibrium (competing equilibria, buffer systems), and descriptive chemistry trivia.

International level: IChO and OIAQ preparation requires university-level organic chemistry (reaction mechanisms, stereochemistry, spectroscopy), physical chemistry, and advanced laboratory techniques.

IChO Performance¶

Spain has participated in the IChO since 1996. All-time record: 0 Gold, 3 Silver, 26 Bronze, 17 Honorable Mentions (29 participations).

Recent team results:

Year	IChO	Location	Results
2026	58th	Tashkent	1 Bronze, 2 HM
2025	57th	Dubai	3 Bronze, 1 HM
2024	56th	Riyadh	2 HM
2023	55th	Zurich	0 awards
2022	54th	Tianjin (virtual)	1 Bronze, 1 HM
2019	51st	Paris	1 Silver, 2 Bronze (best year by medal count)
2018	50th	Bratislava/Prague	1 Bronze, 1 HM
2002	34th	Groningen	2 Silver, 1 Bronze (best year by medal quality)

Spain has never won an IChO gold medal. The country consistently earns 1–2 bronze medals per year.

OIAQ Performance¶

Spain is one of the stronger OIAQ nations, regularly winning medals. The country hosted two editions:

1999 (5th): Santiago de Compostela
2004 (9th): Castellón

At the 29th OIAQ (2025, Mexico), Spain won the competition overall. Carlos Calderón Alba was first place overall, and Víctor Zhou Albal won gold with the highest theoretical score. All four team members medalled.

Student Outcomes¶

Olympiad awards do not provide automatic exemption from the Selectividad/EBAU (university entrance exam) in Spain. However, top performers at the national phase earn the privilege of choosing any science-related degree at the hosting university.

Internationally, national-level olympiad prizes are valued by US and UK universities as evidence of intellectual vitality and subject suitability. Top performers typically study chemistry, chemical engineering, or related sciences at Spanish universities.

Notable recent performers include Víctor Zhou Albal (IChO 2025 bronze, IChO 2026 bronze, OIAQ 2025 highest theoretical score) and Carlos Calderón Alba (OIAQ 2025 overall first place), both from the Valencia district.

History¶

~1987: First regional chemistry olympiads held (Asturias records show the 1st regional edition in 1987).
1980: RSEQ established as independent entity (split from combined RSEF/RSEQ).
1995: OIAQ founded; Spain participates from early editions.
1996: Spain's first IChO participation (no medals).
1997: First IChO medal (1 bronze, 1 HM).
1999: Spain hosts 5th OIAQ in Santiago de Compostela.
2002: Best IChO result: 2 silver + 1 bronze.
2004: Spain hosts 9th OIAQ in Castellón.
2019: Second-best IChO year: 1 silver + 2 bronze.
2025: Spain wins OIAQ overall (29th edition, Mexico). Carlos Calderón Alba is top individual.